Wingspan 8 to 10 mm.  The larva mines the leaves of Goosefoot (Chenopodium) and Orache (Atriplex) and other plants in this family, creating a clear blotch mine with black frass in large lumps

Some species of fly also mine Chenopodiaceae, and mines can be similar

Adult leaf mine

Backlit image of mine; note host species

Roadside verges, disturbed and waste areas where the larval foodplants Orache, Fat-hen and Goosefoots are found.

A bivoltine species, with adults on the wing in May and June, then again in August.

The larva is a leaf-miner, creating whitish blotches in the leaves of the foodplants Orache, Fat-hen and Goosefoots.

Widely distributed throughout the British Isles, and common in some places. In the Butterfly Conservation's Microlepidoptera Report 2011 this species was classified as local.

Most frequently recorded as a leafmine record in Leicestershire and Rutland.

http://www.leafmines.co.uk/html/Lepidoptera/C.sexguttella.htm

https://bladmineerders.nl/parasites/animalia/arthropoda/insecta/lepidoptera/ditrysia/gelechioidea/gelechiidae/gelechiinae/anomologini/chrysoesthia/chrysoesthia-sexguttella/